opnsense-disk-extend.sh

# Variables
DISK=da0;
ROOT_PART_NUM=3;
SWAP_PART_NUM=4;
ROOT_FS=/dev/gpt/rootfs;
SWAP_FS=/dev/gpt/swapfs;
SWAP_PART="/dev/${DISK}p${SWAP_PART_NUM}"

# Show info
gpart show;
swapinfo;

# Turn off swap
swapoff -a;

# edit /etc/fstab so the swap partition doesn't mount
# $SWAP_PART none swap sw 0 0;

# Delete the swap partition
gpart delete -i $SWAP_PART_NUM $DISK;

# Extend the root partition
growfs -y $ROOT_FS;

# Resize the root partition to 32G
gpart resize -i $ROOT_PART_NUM -s 32G $DISK;

# Make a swap parition of 3500 Megabytes at the end of the disk
gpart add -t freebsd-swap -s 3500M $DISK;

# Turn on swap
swapon $SWAP_PART;